Pike and his ready rooms. On Discovery they apparently always HAD an expansive set, located a half-deck or more above the main bridge, sitting empty while Lorca used a supply closet as his ready room space. Pike rolls up and within an episode he's repurposed the much larger space as his own, leaving the former closet to become a lab or something.
The ready room on the SNW Enterprise is tough to rationalize on even the 440m version of the ship. And moreover, if THAT MUCH space is somehow crammed into the deck 1 superstructure, what's on the OTHER side to balance that out? The bowling alley?
Mark